2022英语周报九上5期答案

第一节【写作思路】审体裁:应用文——件审题}审时态:一般现在时或一般将来时为主审人称:第一人称为主要点1你打算学的专业如 computer scieneChinese literature. medicine F要点2:你想要从事的职业如 prgrarnmer, teacher提纲iter, dottor等。注意职业与专业的一致性点3你选择的理由如i' s significant to masterhave been interested in/strong pafor等拓展和延伸:询问对方看法或打算,如 what do you屑写作think of., how about your plan对要点进行细节添加,调整框架結构写作使用各种从句、虚拟语气、倒装句、插入语以及高緩词等,创造语言亮点把构思好的素材通过一些过渡词连接成通順完整的文章查语篇结构:内容是否切题,详略是否得当,段落衔接是否连贯检查}查语法:主谓形式是否一致,时态是否恰当词性是否准确查词数:写作词数是否符合标准—80词左右佳作展台】Dear JackI'm glad to receive your e-mail asking my future major and careerHere's what I want to share with youSince middle school. I've been fond of Chinese literature. which Iplan to choose as my major. Besides my passion, literature is meaningfulIt opens before us the door to an entirely different territory and agebroadening our horizons. Accordingly, I hope to be a Chinese teacherwho can convey the beauty of Chinese literature to otherSo what do you think of my plan? Looking forward to hearing from youYours,Li Hua【亮点梳理】亮点词汇: be fond of, passion, open the door toconvey等。亮点结构:非限制性定语从句( which I plan to choose as my major和 who ean convey the beauty of Chinese literature to others);现在分词短吾作状语( broadening our horizons)等

【解析】1)设AC的中点为O,连接BO,P(2由题意,得PA=PB=PC=√2,=《PO=1,AO- BO=CO=1.2分因为在△PAC中,PA=PC,O为AC的中点,所以PO⊥AC,………a-138 x284( 1)因为在△POB中,PO=1,OB=1,PB=√2,4分PO OB=PF,所以 POL因为AC∩OB=O,AC,OBC平面ABC,所以PO⊥平面ABC因为PC平面PAC:所以平面PAC⊥平西ABC.……((2)由(1)知,BO⊥PO,BO⊥AC,BO⊥平面PAC,所以∠BMO是直线BM与平面PAC所成的角,BO且tanBMO-OMOM所以当OM最短时,即M是PA的中点时,∠BM最大,7分由PO⊥平面ABC,OB⊥AC,所以PO⊥OB,PO⊥OC,于是法OC,OBOP所在直线分别为x轴,y轴,轴建立如图所示空间直角坐标系,O0.0C0BC01.0.AC-1.0,P(0D.(- ,0)9分成=(1.-1,0,)(1,.-1,威=(-)设平面MBC的法向量为m=(,y,)令21=1,得y2=1,的=3,即m=(1,1,3).……………………………““”““……BCE=0得10分MC=0,(3x1-1=0,设平面PBC的法向量为n=(x,y,),0,-32=0令x=1,得3=1,a=1,即n=(1,1,1).……………………………由得=011P=0/33cos(n, m)m:1方312分由图可知,二面角P-BC一M的余弦值为5√3点P为圆C1上的任意一点,线

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